Piston rod for double-acting internal-combustion engines



Dec. 19, 1922.

H. H. BLACHE.

PlsroN RoD'FoR DousLE AcTlNs INTERNAL CoMausTloN ENGINES. FILED JULY 5. 1921 Patented Bec. I9, 1922.-

'rear Fir-fics,

HANS HENRIK BLACHE, OF COPENHAGEN, DENMARK.

PISTON ROD FORDOUBLE-ACTING INTERNAL-COMBUSTIGN vENGLINES.

Application filed July 5, i921. sei-mino. 482,572.

A'cting Internal-Combustion Engines, ofv

which the following is a specification.

In double-acting internal combustion engines, it is well known to supply and carry7 away the cooling-water through a boring in the piston-rod. Where the piston-'rod passes through both the top and the bottom covers the cylinder, it is well known to provide the piston-rod with a .central boring in such a manner that the cooling-water is pumped through the piston-rod and piston from one end to the other. Vhere the piston-rod does not pass through the top and bottom covers of the cylinder, it is also known to use sucha central boring through the piston-rod, but in such case the 'central boring is provided with a pipe arranged in such a manner in the centre of the boring that the cooling-water is supplied through the pipe and carried away through the annular channel between the pipe and the wallsfof the boring.

The above mentioned constructions have, however, the defect that the walls of the piston-rod are too thick and the cooling of the surface of the piston-rod is therefore not suiiiciently effective.

The present invention relates to a oonstructional form in which-the above-mentioned defect is obviated the cooling-water being carried through the piston-rod in such a way that it passes through the rod near the surface. The cooling of the rod near the surface is of they greatest importance, because the piston-rod passes outv through the cylinder cover through a stufling-box, which is packed with a suitable packing. The piston-rod must vthere vbe covered by a thin lm of oil to prevent leakage through the stuffing-box and also to prevent scratching of the surface of the pistonlFig. 2 is an enlarged end view vof the piston-rod.

rasant l The-piston-rod a is provided at both ends with reduced portions or stems-Z), whereby it is'fyconnected at one end to the piston f and at the other end to the crosshead 7L. The piston-rod a is provided with a central boring c, and also with an annular series of'smaller borings Z which are situ-' ated directly under the surface'of the piston-rod in such a manner that the rod wiil be effectively cooled by the cooling-water which flows through the borings d. 'Ihe piston-rod is, as before-mentioned, connected to the piston and there held in place by the nut e (Fig. l In the boss at hub yof the piston an annular series of passages f7 is formed, which passages register with the borings d inl the piston-rod, said borings opening through the shoulder produced con-- sequent upon the reduction of the rod end.

The cooling-water is supplied to the central boring c in the piston-rod, f in any suitable manner, and from the boring c it.

is conducted into the piston which is hollow, thereaftery leaving the piston through the passages g in the hub of the piston and la central bore and an annular series of bores K' located close .to its peripheral surface, all

of which bores extend longitudinally from end to end of the rod; and a hollow piston having its hubv mounted on one end of said -rod and formed with an annular series of passages in register with the annular series of bores in the rod, the central boreof said rod opening immediately into the interior of the piston, whereby the cooling iuid may be supplied to said piston through said central bore and discharged therefrom through said annular series of passages and bores, or vice versa. p c

2. The combination of a piston rod having a central bore and an annular series vof bores located close to its peripheral surface, all of which bores extend longitudihally from end to end of the rod; a hollow y being discharged through the borings CZ near` y peon having Vits hub mounted on one encl of Saud rod and formed u'lth an annular series oil'` passages 1in regle-ter ufrl theedac'ent' ends of the annular series of bores n he rod; and a cross-head having an opening in which 'the other end of Jhe rod is mounted und also having en annular series of passag'ee in register with the other ends o he annular series of rod bol-est' he central here of said rod opening 'at one 'end lnxmeclately into the interior of he piston,

lio said piston through. said eentraljbore 'and Cheoharged VKrherefrorn through Seul annular series ol' pireeagee and bores', or x Ace verse.

B. Theoolnbnalaion of a 'pison redhaw lng a 'reduced portlon at one end proy'lchng' Siem and 'a lateral Shoulder enelr'clngfthe saine, said roel being formed with u eenrul longltudlnal bore Wlnoh opens utone enrl khrtmgh sad `Stenn and "with en nnular series of passagee and bores, or ricererszi.'

In tetrnon'yA whereof.E 121m); xny signeture.' y 

